increase font size

On your left hand side column how do you Increase the font size?

First, select Create Slides under the Slides option in the top menu of Presenter. Select one of the three templates to get started. If you select either the Title or Title and Content templates, there will be a few text/media boxes available for you to work with. Each box can be assigned to hold either Text or Media under the Box Type in the slides toolbar.

If your box is a Text type, you can format your font, font size, colors, etc. in the Text Formatting tab on the toolbar.

If you want to increase the size of the font used to display the list of items in the left column, there is no way inside Presenter to do this. You'll have to go to your OS settings and either decrease the display resolution or increase the scale. This will increase the size of everything for all programs, not just Presenter. On a Windows 10 computer, go to Settings > System > Display > Scale and layout. And it's probably best if Presenter is closed when you do this.