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You cannot change the font of the DTU8 Debugger menu, but you can change the font size for register data (SFR) display etc. However, you need to change the font size for each window. The procedure is shown below, using the example of changing the font size of the SFR window.
Step 1: Select [Tools]> [Preferences] of DTU8 to display the [Environment settings] dialog.
Step 2: In the [Format] tab of the [Environment settings] dialog, select "SFR" in "Window" and "SFR name text color" in "Element", and click the button with the font name currently set in "Font".
Step 3: In the [Font] dialog, change the size and click the [OK] button to close it.
Step 4: Click the [Apply] button in the [Environment settings] dialog, and if there is no problem with the size, click the [OK] button.