Normally I don't leave my bows strung. I store then on a horizontal rack.
The exceptions are I leave my primary strung during deer season, and when I'm breaking in a new string.
I put the new string on and shoot to find the initial brace & nock settings. I leave the bow strung and check brace height,twisting as needed to get back to the original height, & shoot every day.
Takes about 7-10 days for the string to stretch & stabilize so the brace & nock remain consistent. After that, I store it unstrung and horizontal...