Nextcloud version 18.0.10
Operating system and version Ubuntu 18.04
How to get back the ability to see the size of the folder / file in bytes in the web interface - files like it was in NC 17? After upgrading to NC 18, this option disappeared from the web interface.
I’m running Nextcloud 19 and the information is displayed as requested, so my advice would be to upgrade to at least that version. 
Thanks for the advice. Since I am not a professional user of Ubuntu, it took me a long time to update the Nextcloud from 18 to 19 and get the “All checks passed” badge in the admin settings. I updated my version of php to the current 7.4 as well. And… nothing changed. I still see only a abbreviated size of folders and files, and when I hover over this number, I don’t get an expanded view of the size.