This is a new feature introduced in Notes 8.5.2. To use this feature, you must have Lotus Notes 8.5.2 or higher as well as an 8.5.2 or higher mail template. To set the default font for new memos, simply:

1. Open a new memo.

2. Click in the body of the new memo

3. Set the font, color and/or size to what you would like the default to be.

4. At the top of the screen, click Text - Set Current Font as Mail Default.