Ridiculous - my last school was like this. SLT would give you a dirty look if they walked past and you happened to be sitting. Never mind they missed all the standing for expo, mini whiteboards, circulating and live marking, show call and live marking a student example under a visualiser. Or that sometimes you need to let students struggle a bit on their own first as long as they understand what they have to do and what they need to do/use in order to achieve it.
My current school is not as bad but I still got feedback from our previous head (through my line manager) that she thought I was leading lessons from the front too much. I'm an MFL teacher and use whiteboards a lot, students' books are filled with evidence of teacher live marking and students responding to it, detailed feedback lessons, I use the visualiser a lot too and frankly with our style of lessons there are shorter exercises and though I pull out MWB to show/improve, do I need to circulate while students are writing a single word or four word sentence on a MWB when I'm about to see them all anyway?
Edit: my classroom climates (and my hearing!) are also such that students feel confident to ask questions which I can answer by modelling or adding vocab to the whiteboard which is at the front of the room). Additionally - my classroom layout is front-facing and I'm not allowed to change it! When I speak to the whole class while walking around, they have to crane their necks to follow me.
I find if I circulate too much or too early it is off-putting to kids and there's nothing to give feedback on yet! Plus it's a poor teacher that can't control a classroom with a look or stern silence while sat at a desk.
I'm pregnant currently and feel more confident about sitting down because of it (that SLT can't tell me off) but I'm still up and moving around a lot of my lessons, squeezing between rows of desks and bags to help students, handing things out even though I get out of breath more easily now. Teaching is a physical job but I think anyone criticising us for sitting down ever should come and observe a whole lesson, look at students' books and data and ask students if their teacher gives them help/feedback during a lesson before introducing their next big idea/lecture. I hate anything introduced just to be performative.