Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the following as you can (you can cut and paste this into your topic):
Nextcloud version (eg, 10.0.2): 11.0.2
Operating system and version (eg, Ubuntu 16.04): CentOS
Apache or nginx version (eg, Apache 2.4.25): 2.4
PHP version (eg, 5.6):5.6
Is this the first time you’ve seen this error?: Yes
Can you reliably replicate it? (If so, please outline steps):
The issue you are facing:
I have noticed that are several functions not showing on my nextcloud. There is no “versions” tab on file details, and also “deleted files” is missing from the files menu. I tried to check for these apps (I dont think it were disabled before, very strange) but I cannot find them.
I am sure it is a quite obvious problem, but I am no able to find the cause.
Any clues?
Best regards.
The output of your Nextcloud log in Admin > Logging:
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
The output of your Apache/nginx/system log in /var/log/____:
Remember, this information may be requested if it isn’t supplied; for fastest response please provide as much as you can 
Feel free to use a pastebin service, otherwise log files can be indented with 4 spaces on each line to present them in a friendlier way on the forum.