Restoring default toolbar layout in Blender 2.81 I'm using Blender 2.81, when I open old Blender files such as Blender 2.80 or older the toolbar layout in the 3D Viewport are different than the default toolbar layout when starting a new project.

This is what it looks like when I open an old Blender 2.80 file



And this is what it looks like when I start a new Blender 2.81 project



And if I open projects from Blender 2.79 or older the toolbar appears on the bottom of the 3D viewport (which is even more annoying). Is it possible to reset all the layouts to the default 2.81 layout?
From the file dialog

When you are in the Open File dialog, click the Settings icon in the top right.

Then deselect Load UI



Setting default behaviour

You can also change the default behaviour by changing your preferences.

Go to Edit → Preferences → Save &amp; Load and uncheck Load UI



Be warned that this might be equally frustrating if your startup file does not contain all the views you would expect.