The MacOS native full screen mode and "Spaces" is one of the worst features of MacOS. Applications like Parallels unfortunately *need* a custom full-screen mode to be usable, IMO. The constant switching I do between applications (ex: via CMD-TAB, or CMD-H) becomes too tedious without. I've been a Parallels user since v2.x and yet I find myself using Parallels less and less because of this tedium ... I am strongly considering not renewing. I represent buying decisions for quite a few licenses. I would rather go back to maintaining a separate laptop to run Windows. Parallels needs to reconsider this decision if they want my continued subscription business. I hate this change that much!!