A list of the most recent files are displayed in the File menu. You can change the number of files displayed here.
Use this option when using a stylus of a Wacom data tablet.
When selected, the front and back of the stylus button are used to change the circular cursor size, and the right-click button is assigned to the button on the end of the pen (the 'eraser'); by default, the front of the button (called a 'switch' by Wacom) is assigned to right-click and the back assigned to double-click.
If you use File>Image Save As to save a single image of an image stack, Microlucida displays a warning message recommending that you should use File>Image Stack Save As to save the entire stack.
If you intentionally save single images, select this option to disable the warning message.