Removing unnecessary stuff on the screen:
If you want to remove all the gubbins at the top of the screen leaving just the expanded website, press F11 on your keyboard.
Then press it again to bring it back. Try it now and see what happens.
Expanding the website on the screen (zooming in):
If you find the writing on the site is too small to read, press Ctrl and + to bring it closer. Repeat to go closer still.
Ctrl and - (minus) to reduce the size. Ctrl and 0 (nought) to bring it back to default. Again, try it now and watch.