I've got an MX Master S3 mouse with the gesture button. When using the "show/hide desktop" gesture, it actually starts a windows search from the task bar (like clicking in the search bar to start typing, which also brings up that menu). The first few times I used the gesture it worked, but I changed it to something else and back, and now the gesture won't work no matter how I configure it: with the preset gestures or setting it to a custom direction manually.

Additionally, the "switch application" gesture could use some improvement. When using the "app navigation" presets, the right gesture swaps right (like alt+tab) and the left gesture swaps left (like alt+shift+tab), as it should be. But when I use a custom set of gestures and map "switch application" in the same configuration, both left and right gestures switch apps to the right (both do alt+tab). I tried overcoming this by using keyboard shortcut gestures instead, but this didn't at all work as expected. All I really want is the "app navigation" preset configuration, but instead of "switch application" also mapped to the gesture button, I want to make that "task view" like it is in the "virtual desktop" preset.