I found a solution on a YouTube video that works great.
Type CTRL-R type shell:appsfolder
When that window opens, scroll down to Microsoft Flight Simulator then you can drag a shortcut onto your desktop and/or add a link to your taskbar. Easy-Peazy.
I'm not using gamepasss, I bought the game outright from Amazon. I can't see any way to launch it other than launching the Store app and launching from there. Surely there has to be a way to put an icon on my desktop and taskbar. But how?