Step 3: Scroll down the content until you find the Windows Explorer process. Step 2: In the Task Manager window, navigate to the Processes tab. Step 1: Right-click on the Windows icon on the desktop and then click Task Manager in the prompted menu. In this case, restarting the explorer.exe process will solve the issue. If the explorer.exe process is corrupted, plenty of graphical issues like Taskbar still showing in fullscreen will appear. The explorer.exe process controls the entire graphical user interface of the PC, including the File Explorer, Taskbar, Start Menu, desktop, etc. After looking into the issue, we find that items like poorly configured Taskbar settings, generic system error, or improper application configuration can result in the Taskbar showing in fullscreen error.Īlso read: Windows 10 Display too Big & How to Resize Computer Screen Fix 1: Restart the Explorer.exe Process To fix the Taskbar showing in fullscreen error successfully, it is vital to find the reasons behind it. Fix 1: Restart the Explorer.exe Process.Why Is the Taskbar Showing in Fullscreen.