There is a shortcut key to switch from Filter to Timeline ? Similar to the keyboard shortcut Esc - Switch Source/Program.
I didn’t find it on the “Keyboard Shortcut Reference” page.
Reason:
I can so directly control the Timeline with the keyboard (for example using the right and left keys) and I don’t have to switch the Filter to the Timeline with the mouse.
Try Shift+Esc
This does not specifically switch focus from Filters to Timeline. It tries to clear focus from whatever currently has it. After that most shortcuts act globally (no focus required).