Hi Cristiano,
I appreciate that you are new to ArchiCAD ... however the four questions that you just asked are all in the User Guide. You might spend some time reading and learning first.
Project Map gives viewpoints. Views contain many settings that inform how a viewpoint will be displayed: layers, scale, pen set, zoom, dimension style, display options and more for 2D .. and 3D window and rendering settings and more for 3D viewpoints.
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB