Are you using Sections for your dashboard?
#Make sensor tile 1x1
rancid tangle
little star
even if so, there are hardcoded minimums for the stock cards, I would bet the smallest you can get that is 1x2 (without doing something custom)
winter radish
button-card would probably let you do it, has a lot of resizing options, but is very much of the "use a bazooka to kill a mosquito" level of overkill
https://github.com/custom-cards/button-card?tab=readme-ov-file#play-with-width-height-and-icon-size
little star
Mushroom cards might do it too.
winter radish
Yeah mushroom cards can get small if you hide all the primary and secondary info to just have the entity icon shown
