The compatibility was added the to GD Plugin.
The theme has options for adjusting layouts for CPTs and you should be able to use those.
GeoDirectory pages like GD Details, GD Archive, GD Search page layout can be managed from page layout settings.
Example: GD Archive Pages now supports page layout settings(sidebars, footer widgets etc…
Try the settings at:
GeneratePress > Elements > Add New
Choose Element Type > Layout
After that, you can use the GD Elements to determine what is displayed.
For any theme, if you are using a sidebar on the listing Details page, then you would want to add GD > Output location to the sidebar.
You can refer to our getting started page here: https://wpgeodirectory.com/docs-v2/geodirectory/getting-started/