The Line Location of a figure can be altered by clicking on the Stroke Tab in the Sidebar, as shown below.
The Stroke Visibility option must be enabled for a Line Location change to appear in the Drawing Canvas.
To alter the Line Location, click on one of the choices under the line location heading. The selection will appear in dark grey as a visual indicator of the currently active line location setting.
The example below shows what a Rectangle looks like when each Line Location choice is selected: Center, Outside, and Inside.
A line location change will be seen instantaneously when a stroke figure is selected. If no figures have been selected, the line join change will apply to all subsequently created stroke figures.