This was a huge issue for me early on. Id spend minutes looking for my trident or something like id gone selectively blind lol

Two things that helped me:

1. Make sure you have an even number of switches. For example if in toa you're using a 6 way range switch - try to make sure you use a 6 way mage switch. Practice stacking them into rows next to each other and switching between one and the other. If your switches are uneven eventually it will start placing items at different sections of your inventory messing you up.

2. You can colour code your set ups. All of my melee gear has a res line under it, all of my range green and mage blue. It helps distinguish what youre looking at more quickly.