CKEditor 5 Full-screen Mode module will be marked as deprecated in version 1.5.0
The primary role of the module was to provide a better experience for users having editor with two sidebars for premium plugins data. And it was created specifically for Drupal.
Then after releasing the CKEditor 5 Plugin Pack we only changed the module's package to reflect that this plugin does not require a commercial license.
Now with CKEditor 5 version 45.0.0 there is official non-premium Fullscreen plugin available for the CKEditor 5. Version v45.2.0 is available in the Drupal core versions 10.5 and 11.2. We will add it to the Plugin Pack in version 1.4.0 and we do not intend to maintain the old one.
The update process (once the new versions will be released) is simply to remove current Fullscreen from Active Toolbar in the text format settings, disable deprecated module, enable new module and add the new Plugin to the Active Toolbar .
We have tested new Fullscreen against all opened issues scenarions, and all of then does not reproduce, thus we'll mark all issues related to Fullscreen as fixed.
Active
1.4
Plugin: Full Screen Mode