I use Linux, which might have something to do with this.
Say I'm on the Inventory menu in the Modern style, with the available buttons on the left.
If I move the mouse into the Add New Item area, the background turns gray. I would assume that means if I click I will get that action. But it does not mean that. I have to put the cursor over the Big Plus icon or over the words to make the text turn black.
THEN if I click I get taken to that screen.
Suggestion: Make the entire background of the button clickable when the background turns gray. That makes navigation much easier.