Change priority of My Shows list?

I am up to 88% of space used. I am not watching my saved content fast enough ;)

I would like to designate some unwatched shows as the 1st to be deleted if TiVo needs the space for new recordings. It seems the oldest content is going to be 1st to be deleted for space. (I already see about 10 Yellow circles instead of Blue!)

I want to change the priority of my long list in My Shows. I know I can go through & change many to ‘keep until I erase’ but, that is a very time consuming task. I’d need to change 80 recordings. I wish to approach it the other way & designate ~ 20 recordings as low priority.

Is this possible? I do not want TiVo to just delete the oldest in My Shows list.

Thanks!