Press F11 to toggle Krita full screen
Press Tab to hide or show the dockers and menus
Go to Window > Workspace > Default to restore the standard layout
Go to Settings > Dockers and enable the panels you want visible
Go to Settings > Show Dockers to turn dockers on or off
Use the right-click menu on the canvas to access some hidden interface options
Press Ctrl+Shift+F to toggle canvas-only mode if available in your version
Drag dockers back from the edges if they are collapsed or hidden
Reset Krita’s workspace if windows do not reappear properly
Check if your operating system is using a separate fullscreen shortcut that may interfere with Krita