Oooh so that's why, okay then.
Again, thank you so much for helping me.

Ok, so I reinstall Opera and install it as you said and now I install it on the D drive, then after I tried restarting my laptop it kept the settings so I guess it's fixed now. Thank you so much for helping.
Oh and I wanna ask, is this some kind of a bug or something?

Yes I can save there, even copy and paste.

Yep, The profile one which is in C:\Users\something\AppData\Roaming\Opera Software\Opera Stable right?
It's writable.

Well, it still acting up. maybe i should un/reinstall the antivirus?

Oh, i didn't install any kind off "cleaner" program.
Well, I installed Opera in the C drive so it's writable, i guess...
And i think they do run in background, i'll try disabling it and get back to you later.

Like what for example? I don't use other browser other than Opera (Probably Chrome/Edge but I never use it)
Maybe an antivirus? I only have Malwarebytes and Eset installed. should I whitelist it or something?
And I don't remember installing any "weird" programs because this happens after I reset/format my laptop.

Okay so i already tried to make another profile and it still happens.

Oh, okay then...
And yes, it also happens when i close and reopen Opera.

New profile as in another account or reinstalling it again?
And yeah, it's just keep resetting back to the default look every time I restarted/turned off my laptop.