Ah so. 
I’m getting the impression the Multi-Cam Timeline is maybe a whole new programming ‘module’ (?) loosely integrated/attached with/to the old platform. The function of the 4-up full screen landscape group is somewhat different and the performance better. The little 4-up groups above the timeline, too. Substantially more ‘solid’ when quickly ‘working them out.’
Wyze intended to rewrite the whole app from scratch at one time but abandoned the idea and pressed on. Maybe this is a way to transform it by ‘module’ in stages?
IANAProgrammer, obviously. Just a sense.