How can we uninstall opigno_lms from Drupal?

It's not a module, but a Drupal profile. The upshot is that Drupal is the dependency, not Opigno. You'll need to remove it with Composer.

Thanks, I've already figured out this part. Now I have problems with uninstalling modules. They have wrong dependencies... I figured out this order so far:
opigno tincan (without tincan api)
opigno moxtra
npx poll activity
npx poll
opigno h5p
Opigno File Upload
Opigno Forum
Opigno SCORM
Opigno Tincan API
Opigno Long Answer
Opigno Scorm Activity
Opigno Video
opigno commerce
opigno search
opigno dashboard
cataloque

but then there is a problem with ilt which requieres opigno calendar and opigno calendar event, but when i unistall it I get errors, because apparently there ilt fields in these modules...

Yeah, it's a bit like getting the sprinkles off without bringing any ice cream with them. It can probably be done, but it's a long, tedious process. I know I've turned off some Opigno modules that I don't use.

You'll probably need to look at them all in Composer to see which dependencies are which. composer show drupal/<module_name> will give you a rundown on any given package. Here's a link to the Composer documentation.