customize the home page traccar web

Good afternoon, I am new to the traccar platform and wanted to know if someone could help me I tried to remove panels from the right and from the left and improve it in the panel below by putting other functionality, but I can not find where that part of that is that code, I have reviewed ext-all-debug.js and not found yet, could someone help me? Thank you

Web interface main viewport is here.

thank you very much Ernesto Vallejo you are a genius