I appreciate it @EricRegnier !
I did eventually stumble across the calendar control while digging through the platform:
https://powerusers.microsoft.com/t5/Building-Power-Apps/Calendar-for-Model-Driven-App/m-p/518082#M158163
That doc you provided is definitely helpful and I am not sure how I missed it. I have spent, what feels like, an absurd amount of time researching this, all part of the learning process though. Anyways, this might be due to some ignorance on my part which touches on a comment you made in your post.
You mentioned, "you'll need Customer Service or Field Service app that sits on top of CDS." We currently do not use Dynamics 365, well, other than CDS for the "potential" MDA that I am attempting to build. So, will we need to purchase a license for D365 or add a subscription for one of the apps you mentioned?
Since we do not use D365, I have not been digging into those docs too much when it comes to finding solutions for the MDA I am working on. Am I shooting myself in the foot here?
Next, with the Web Client being deprecated and the transition to UI, how much of the functionality of the "Classic" Solutions Manager will be carried over? For example, I was trying to work with a filtered Look Up Field recently, pretty straight forward in the Classic SM but not available in UI. (Coincidentally, https://powerapps.microsoft.com/en-us/blog/lookup-filtering-enhancements-in-unified-interface/ was posted that day or the day after. I still have not figured out how to actually work with the filter in UI).
Anyways, I have been reluctant to use the Classic SM as I anticipate there will be at least a "few" functions that Microsoft, for what ever reason, will "decide not to make available at this time."
My apologies, I am still relatively new to PowerApps (specifically MDAs, I have not made it to the Canvas Apps yet, but will need a couple in the near future) and attempting to wrap my brain around the "complexity" (to put it nicely) of the D365/PowerApps/PowerAutomate/PowerBI/Power Platform "beast."
I appreciate your time!