Is there any problem with exchanging a pair of shoes for a different size during chol hamoed(the originals were purchased a month ago)

Is there any opinion that holds that one is allowed to place fully cooked food on the blech on Shabbat and pick it up then put it back the next day? e.x- on kiddush night I removed the fully cooked dish from the blech and placed it in the fridge, then during the day I take it out of the fridge and put the dish back on the blech to warm it up (but it’s fully cooked), because I read Rav moshe doesn’t allow

It you remove cholent from the slow cooker on Shabbat day, can you place it back on since the cholent is already cooked?