Middle mouse button setting conflict with sidebery.

[MKRBGR]

I am using sidebery for tabs management. I was using middle mouse button for unloading tabs but middle mouse button is set to open or close pointed tab. It is so annoying to right click and go to unload choice. Auto unloading conflict with sidebery unload and still timing it is not good in enough. Also that does not work on pinned tabs. And in settings there is no setting to change this. I was endured this like 2 week but for a person who has too many pinned tabs, and I gotta unload when I don't use them, it is painful. Literally I am thinking to switch Floorp again. Are there any one knows how to change or fix this?