Folder Permissions

So I have a file server that has lots of important files and other data, recently I was modifying one of the folder permissions but accidentally removed one of the permission entries. Sadly, I don't remember what was selected in that particular entry, my questions are:

1. Would performing a System Restore to a time where the entry wasn't deleted be possible? since I forgot what boxes were checked in that particular entry and does it apply to other permission entries that were pre-installed into the windows 10 OS?

2.If i click on or Highlight a particular entry (which is under properties -> security -> Advanced) will the "Change permissions" button (bottom left) change to View, Delete, and modify or would I have to click on it and accept the UAC?

3. Does double clicking on a permission entry or highlighting it does it still change the Owner of that particular folder, or do it the normal way which is clicking the "Change" button next to the Owner of that folder?

I did perform all the necessary backups from that server to a different one right before I started writing this thread. Your help is greatly appreciated, Thanks in advance!

It's hard to say not knowing what you have done it what you want to do. Unless you removed rights from admin you can add back others. The only way is to test access for users and see who can't get on it do what's needed