Increase the size of the visual cures to enhance clarity

Dear All,
For now, we can see a tiny icon in the upper-left corner of their picture when somebody raises their hand. It would be of great help for visually-impaired people to be able to increase (a lot) the size of this icon, even for a normally sighted person it is difficult to see it when there are a lot of people.
P.S: Maybe the option already exists somewhere and I missed it.