I was on a RS tour in Sicily in March. We were a rather small group of 12 plus the guide. During our group meals, we sat the same way we did during pre-Covid tours - together at one (or sometimes two) tables. Italy required masks indoors (anywhere). Once you reached the table, you could take the mask off for the meal.. We had a terrific time - eating, drinking, socializing. I would have it no other way.
People in the group broke off in smaller groups for our independent meals. I ate with groups ranging from 2-8 people during those meals. No masks during these meals either.
We had all been required to present vaccination records as well as a negative test taken within 48 hours of the beginning of the tour. Essentially we became a “pod” together and, I think, we all felt quite comfortable. It was wonderful to experience a level of “normal.” As far as I know, nobody tested positive before their flight home.
I would expect that larger groups of 20+ people would often be broken up into smaller tables, simply because most restaurants would not be able to seat such a large group together. This was true on RS tours before Covid.
If dining in a group or inside a restaurant makes you feel worried or uncomfortable, it might not be time yet for you to join an organized tour. Independent travel might be best in that case.