I 100% hear you @Sunshineismyfavourite and have had the same issue with several museums, and art galleries, and stately homes. One did it last year. I tried looking peacefully at the displays and artifacts and paintings and sculptures etc etc, and some random volunteer from the place walks up to me and starts chatting to me, and goes into great detail about what I am looking at.
Firstly, if I want to know I will ask.
Secondly, I do actually do often KNOW some stuff about what I am looking at already.
Thirdly, most things have little signs at the side and notices in a laminated frame, with the information on, about said item.
One man kept me and DH is a really hot room 3 summers ago. It was about 80F (27 C,) outside and it was humid! It must have been 95F in this room, (35 C!) and it had a big skylight, and I was cooking on the inside!
We had masks on too (it was mid 2021 - fuck you covid!) and I was dying!
DH was starting to flag too, but like me, he was too polite to say anything!
After 15 minutes I said 'I really have to go - I am dying from the heat I'm so sorry.... ' The man seemed fine, but he was about 30 - and slim. I was 50-odd and menopausal and a bit chubby! 😆 DH too! (Well apart fro the menopausal bit!)
But yeah, I KNOW these people are being nice and kind and helpful, but they shouldn't bother people unless they ask. As I said, there are loads of signs and bits of information on each thing you are looking at anyway. I think they must just be wanting to relieve their boredom! 😆
It's easy for people to say 'you should say leave me alone,' but it's not that easy to actually DO it.
Some people in small independent shops do this too. I HATE going into any shop when there's no-one in there, because they are just sitting behind the counter and you feel you have to strike up a conversation with the person behind the counter. When all I want to do is look around for 10 minutes!
Same with market stalls. I feel awkward looking at the stock, because the owner of the stall just looks at me and smiles, and I feel I have to chat to them, and feel bad if I don't buy something!