It's sometimes very difficult to find a particular type of item in the maps, mainly because even when you toggle a filter, it's not always possible to see its corresponding icons toggling. Having a button in the filter controls to select or unselect all filter checkboxes would really help with this!

What would be even better is if the existing filter selections could be toggled, e.g. if I have 45 out of 90 (just random numbers for illustration purposes, by the way), then I could toggle those 45 off then on again using a button, so this would be like the select/unselect all, but only being applied to my normal selected filter checkboxes.
Just something to consider, ZOS, to make the map filters more practical to use.
PC(Steam) / EU / play from Melbourne, Australia / avg ping 390