I actually went the complicated route since Nova is kinda janky with full screen gesture navigation.
I downloaded the Shortcut Maker App
For each app I wanted to theme in the Samsung launcher I added a shortcut widget to open that app and selected the icon from the Meeye pack.
it's a different app though!, and that preset is only available in pro version!
link :- https://play.google.com/store/apps/details?id=com.candl.auge&hl=en
Outlook calendar is not syncing with Android native calendar app, that's the restriction from Microsoft. You need to look for alternatives.
If you are office 365 user, you may consider buying nine email and calendar (I get no benefit by suggesting this), which will sync office 365 calendar to the android native calendar.
Edit: you may try DAVx⁵ which is free and open source app to sync calendar / contacts etc.,