Yeah, but what I'd prefer is a smart cover design like Apple's iPads. No biggie - the slipcase I have will suffice. I've looked but as far as I can tell, a cover flap for just the tablet doesn't exist.
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I typically leave mine (Surface Book 2) on "Recommended" when on battery and "Better Performance" when on AC.
The setting manages the CPU's base and turbo frequencies and power draw.
When I'm on battery and I know I'm going to be using it heavily while away from a power source (or when using just the tablet portion of my Surface Book 2, which has only a small battery; not applicable to your Surface Pro), I'll switch to the Battery Saver setting. That drops the screen brightness levels & max brightness and drops the CPU frequency down significantly, though performance is still more than sufficient for most things on my SB2.
Oh gotcha, yeah. I have seen some folio covers for the entire device, but at best they look like they are made to accommodate the SB2 in "display mode," not display portion by itself. That would be useful, I am surprised nobody does one.