I am really new to krita an accidentally closed the “advanced color selection” tab, so I clicked on “restore default settings” and it solved my problem, but it merged all my layers mid-drawing, how do I get my layers back? I tried pressing ctrl+z but it doesn’t work and the undo button doesn’t as well.
Restoring the default settings shouldn’t merge your layers. As long as you worked on a kra file (or anything that supports layers) they should still be there (when you worked on a PNG or JPG your layers where only there for the session because these files don’t support layers, every save would merge them).
Maybe you accidentally pressed the shortcut for merging down layers and its to far back that it’s not in the undo history anymore, or you closed the file in between than you can’t go back either because the undo history is not preserved. In this case there is no way to restore the layers.
Are you sure the layers are not just simply in a collapsed group layer?
I thought I had saved everything in .kra, but It seems that only it only saved like that in old ones and still, when I open them, the layers are merged.
Yea, when it’s not saved as a Krita file (kra) then it most likely has no layers because the file type doesn’t support layers.
Can you post a full screen screenshot of Krita with the file open?
Okay, but I think that’s the problem I saved once as .kra and I thought it was going to autosave as .kra after that, but it doesn’t…
This can easily happen when you start as kra and than at one point use “save as” and chose PNG for example. Then this new file will become the new document. Krita will warn you that the layers will get lost but only the first time I believe. Then it will use the new file. When you want to save to PNG i.e to share or upload the file use the “export” option from the menu. It will create the new file without making it the new active document. The good news is (if you are lucky), if it happened like i wrote, you should have still have a kra-file lurking somewhere on you system (if it ever actually was saved as kra file).
I know this doesn’t help much now but it’s good to know for next time.
yeah, I’m trying to find that file, I found one really old one, bu I’m trying to find if It saved as .kra in a more recent version
And people think I am weird for thinking save should only use kra file format and export should be the other file formats that don’t actually save nothing.
I don’t think you’re weird. GIMP does that and it seems very sensible to me.
It does autosave as .kra (assuming autosave is enabled) but the purpose of the autosave file is for recovery after a crash. If there is a crash, the contents of the autosave file will be offered to you at next start.
If you Quit normally, that means there was no crash so krita deletes the autosave file as the last thing it does before it shuts down.
That’s a subject with many tense when debate start about it…
Not sure that’s a good idea to restart it here 
Grum999