Use checkboxes at the top to enable/disable layers.  Some checkboxes requires that the corresponding Menu choices be selected.

• Database display--these have the DB table open.
• TIGER options--the data must be in the correct location, and indexed.
• Contours
• Carto DBs--drawn only, and not opened for GIS database operations (may not be working); use options on Database menu
• Grid
• Gazetteer
• PLSS
• SRTM water bodies
• World outlines
• US outlines
• Tissot

Use SHP button to add Database (shape file) overlays.

For panels in the middle of the form:

• Use buttons on the left to modify drawing options.
• Use the arrows to move layers up/down in drawing order.Layers at the top will be drawn last, and will be on top of the map. They may obscure lower layers.