Page scrolling zoom when press cmd+tab?

I am using Mac Marginnote3, when I scroll page to read something and try to switch to another window, I press cmd+tab, then the zoom level in marginnote would change. It seems detected cmd+scroll-up/scroll-down then therefore change zoom level. It would be annoying when use Mac margin note to multitask. How to disable that?

Buddy Just be grateful for u can make a zoom !!!

As an ipad user we have to use +/- buttons in most absurd position at keyboard that u can imagine