Open the Options from the SAP Logon.
Click on the Font Settings under the Visual Design. Click on the Select button to list out the fonts available.
You can select the fonts and sizes from here. FYI, there are not many fonts selection available for you to choose. Once confirmed, click on OK. To get the change activated, no restart needed, you just need to start a new SAP session.
Done! (but the font size is too big)
