How to rename / view /specify specific boundaries in the geometry.

Dear sir,

I have a trouble locating specified boundary in the geometry. I am new to learn COMSOL. I follow up tutorials that asks me to define certain conditions at certain boundaries. I depend on adding manually all boundaries and removing the unnecessary. Isn't there any method I can use to locate the boundary easily e.g: viewing their numbers on the model. And also, isn't there any method to rename the boundary by an appropriate name describing its physics like: Wall1, Flux 5, instead of 1,2,3,4.....etc.

I hope to have answer on my question early.

Thanks and best regards