If you are using Chrome, which is preferred, go to the top right corner where there are three dots in a row. The 7th option down is a Zoom toggle with -/+ to adjust.
The shortcut for screen adjustment is to hold down Ctrl and click the minus key, "-" to decrease the zoom.
When you leave the screen and want to reset it, click inside the magnifying glass in the URL address line. There will be a Reset option.
