I've encountered a situation where I am seemingly unable to select sketch geometry or features, already several times. I'm a beginner and this has caused me by surprise every time, and it's taken a few incidences for me to make a mental connection between cause and effect. Essentially, what happens is that I set up a selection filter in Tool bar > Select > Selection Filters, and then I forget to remove the filter once it's no longer needed.
The reason why this happens is that the selection filter check boxes are not one click away. They are buried in a sub-menu---the bottom-most sub-menu, to be precise---and once you set up your filter you go off and focus on the task at hand, which may take minutes. By the time the task is completed, you've already forgotten that there's a selection filter in place.
I would like to propose a few ideas to improve how selection filter are accessed:
1) Currently only commands can be pinned to the toolbar. It would be very nice if sub-menus could also be pinned. That way we would then be able to pin the Selection filters sub-menu and therefore quickly check selection filter state with a single click (just expand the menu and see what's checked and what isn't). Menu diving is never fun and I can only expect Selection Filters is being under used simply because it requires menu diving.
2) Another possible approach would be to have a selection filters floating palette, similar to the sketch palette, that mirrors the selection filters in Tool bar > Select > Selection Filters, thus making these options very immediate.
3) Another idea would be to overlay an indicator (e.g. a conspicuous red dot) to the Select menu to indicate that not all items under Selection Filters are checked, as I crudely illustrate below:

4) Along the lines of number 3) above, there could be a pinnable command to Reset Selection Filters, with two states, one to indicate that all checkboxes are checked and another to indicate that some boxes are un-checked.
5) Also, it would be great to have a two-state menu item (which could of course be pinned to the toolbar, too) to toggle filters ON and OFF. This would enable users to temporarily disable filters without having to Select All, which is a destructive command (filter settings are lost). The command, when pinned to the toolbar, could be used to indicate whether filters are enabled or disabled. Currently, as I said, there is no way to tell if filters are active without menu diving.
Many thanks!!