Adding new brand color window does not show SAVE button on mac

When adding the first new brand color, the color selecting popup does no show the "save" button which is lower offscreen, as in the video attacged. You cannot scroll down the main browser window unfortunately to display the button so the only workaround, for a savvy person, is to zoom out the browser window. When adding subsequent colors this problem does not reappear because the popup trigger is somewhat higher above... This appears on a 16" Macbook Pro with the Firefox browser window fully maximized. However, the browser window on the mac does no maximize full screen because it leaves room fo the dock icons. So it is safe to assume this issue cannot be replicated on windows.