Solved Several issues after upgrading Joomla 3 to 4 with the latest version of Kunena

You mean the menu in the back room is available. What is the cause of this problem? See screenshot.

The problem is caused by the incorrectly created menu item (red marked).
Menu Issues  
Menu Tips
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Already with reply and edit post there are no errors, but there is still no menu at the top. I did everything according to the instructions you posted. Maybe there's something else I haven't done?

Clear the Joomla and browser cache. If this does not help, please add a configuration report again.

Clearing the cache doesn't help, I did that. configuration report
 

Database collation check: urz5d_kunena_aliases have wrong collation of type utf8_general_ci on field alias urz5d_kunena_aliases have wrong collation of type utf8_general_ci on field type urz5d_kunena_aliases have wrong collation of type utf8_general_ci on field item urz5d_kunena_announcement have wrong collation of type utf8_general_ci on field title urz5d_kunena_announcement have wrong collation of type utf8_general_ci on field sdescription urz5d_kunena_announcement have wrong collation of type utf8_general_ci on field description urz5d_kunena_attachments have wrong collation of type utf8_general_ci on field hash urz5d_kunena_attachments have wrong collation of type utf8_general_ci on field folder urz5d_kunena_attachments have wrong collation of type utf8_general_ci on field filename urz5d_kunena_attachments have wrong collation of type utf8_general_ci on field filename_real urz5d_kunena_attachments have wrong collation of type utf8_general_ci on field caption urz5d_kunena_categories have wrong collation of type utf8_general_ci on field name urz5d_kunena_categories have wrong collation of type utf8_general_ci on field alias urz5d_kunena_categories have wrong collation of type utf8_general_ci on field icon urz5d_kunena_categories have wrong collation of type utf8_general_ci on field accesstype urz5d_kunena_categories have wrong collation of type utf8_general_ci on field channels urz5d_kunena_categories have wrong collation of type utf8_general_ci on field description urz5d_kunena_categories have wrong collation of type utf8_general_ci on field headerdesc urz5d_kunena_categories have wrong collation of type utf8_general_ci on field topictemplate urz5d_kunena_categories have wrong collation of type utf8_general_ci on field class_sfx urz5d_kunena_categories have wrong collation of type utf8_general_ci on field iconset urz5d_kunena_categories have wrong collation of type utf8_general_ci on field params urz5d_kunena_configuration have wrong collation of type utf8_general_ci on field params urz5d_kunena_logs have wrong collation of type utf8_general_ci on field ip urz5d_kunena_logs have wrong collation of type utf8_general_ci on field operation urz5d_kunena_messages have wrong collation of type utf8_general_ci on field name urz5d_kunena_messages have wrong collation of type utf8_general_ci on field email urz5d_kunena_messages have wrong collation of type utf8_general_ci on field subject urz5d_kunena_messages have wrong collation of type utf8_general_ci on field ip urz5d_kunena_messages have wrong collation of type utf8_general_ci on field modified_reason urz5d_kunena_messages_text have wrong collation of type utf8_general_ci on field message urz5d_kunena_polls have wrong collation of type utf8_general_ci on field title urz5d_kunena_polls_options have wrong collation of type utf8_general_ci on field text urz5d_kunena_sessions have wrong collation of type utf8_general_ci on field allowed urz5d_kunena_sessions have wrong collation of type utf8_general_ci on field readtopics urz5d_kunena_smileys have wrong collation of type utf8_general_ci on field code urz5d_kunena_smileys have wrong collation of type utf8_general_ci on field location urz5d_kunena_smileys have wrong collation of type utf8_general_ci on field greylocation urz5d_kunena_topics have wrong collation of type utf8_general_ci on field subject urz5d_kunena_topics have wrong collation of type utf8_general_ci on field first_post_message urz5d_kunena_topics have wrong collation of type utf8_general_ci on field first_post_guest_name urz5d_kunena_topics have wrong collation of type utf8_general_ci on field last_post_message urz5d_kunena_topics have wrong collation of type utf8_general_ci on field last_post_guest_name urz5d_kunena_topics have wrong collation of type utf8_general_ci on field params urz5d_kunena_users have wrong collation of type utf8_general_ci on field status_text urz5d_kunena_users have wrong collation of type utf8_general_ci on field view urz5d_kunena_users have wrong collation of type utf8_general_ci on field signature urz5d_kunena_users have wrong collation of type utf8_general_ci on field avatar urz5d_kunena_users have wrong collation of type utf8_general_ci on field personalText urz5d_kunena_users have wrong collation of type utf8_general_ci on field location urz5d_kunena_users have wrong collation of type utf8_general_ci on field friendfeed urz5d_kunena_users have wrong collation of type utf8_general_ci on field bebo urz5d_kunena_users have wrong collation of type utf8_general_ci on field digg urz5d_kunena_users have wrong collation of type utf8_general_ci on field icq urz5d_kunena_users have wrong collation of type utf8_general_ci on field telegram urz5d_kunena_users have wrong collation of type utf8_general_ci on field vk urz5d_kunena_users have wrong collation of type utf8_general_ci on field microsoft urz5d_kunena_users have wrong collation of type utf8_general_ci on field skype urz5d_kunena_users have wrong collation of type utf8_general_ci on field twitter urz5d_kunena_users have wrong collation of type utf8_general_ci on field facebook urz5d_kunena_users have wrong collation of type utf8_general_ci on field google urz5d_kunena_users have wrong collation of type utf8_general_ci on field myspace urz5d_kunena_users have wrong collation of type utf8_general_ci on field linkedin urz5d_kunena_users have wrong collation of type utf8_general_ci on field linkedin_company urz5d_kunena_users have wrong collation of type utf8_general_ci on field delicious urz5d_kunena_users have wrong collation of type utf8_general_ci on field instagram urz5d_kunena_users have wrong collation of type utf8_general_ci on field qqsocial urz5d_kunena_users have wrong collation of type utf8_general_ci on field blogspot urz5d_kunena_users have wrong collation of type utf8_general_ci on field flickr urz5d_kunena_users have wrong collation of type utf8_general_ci on field apple urz5d_kunena_users have wrong collation of type utf8_general_ci on field qzone urz5d_kunena_users have wrong collation of type utf8_general_ci on field weibo urz5d_kunena_users have wrong collation of type utf8_general_ci on field wechat urz5d_kunena_users have wrong collation of type utf8_general_ci on field yim urz5d_kunena_users have wrong collation of type utf8_general_ci on field whatsapp urz5d_kunena_users have wrong collation of type utf8_general_ci on field youtube urz5d_kunena_users have wrong collation of type utf8_general_ci on field ok urz5d_kunena_users have wrong collation of type utf8_general_ci on field websitename urz5d_kunena_users have wrong collation of type utf8_general_ci on field websiteurl urz5d_kunena_users have wrong collation of type utf8_general_ci on field ip urz5d_kunena_users_banned have wrong collation of type utf8_general_ci on field ip urz5d_kunena_users_banned have wrong collation of type utf8_general_ci on field reason_private urz5d_kunena_users_banned have wrong collation of type utf8_general_ci on field reason_public urz5d_kunena_users_banned have wrong collation of type utf8_general_ci on field comments urz5d_kunena_users_banned have wrong collation of type utf8_general_ci on field params urz5d_kunena_version have wrong collation of type utf8_general_ci on field version urz5d_kunena_version have wrong collation of type utf8_general_ci on field build urz5d_kunena_version have wrong collation of type utf8_general_ci on field versionname urz5d_kunena_version have wrong collation of type utf8_general_ci on field state

Sorry, but I can't see the menu because the configuration report is not complete.