I have not seen this - what tool are you using? Off hand I don't think it's possible, but happy to test out on my end if you have the macro (I assume it is one)
This applies to any tool with an input anchor allowing multiple connections, like the Union tool
Unfortunately, I don't think it's currently possible to change this setting. However, I might be asking if there's a way to simplify 10 inputs down to less inputs using a more dynamic option!