ArcGIS PRO - Change basemap in layout view

[CrystalCraig]

I know how to add a Basemap when creating a New Map. However, I have a basemap in Layout view. How do I change my basemap in Layout View within ArcGIS Pro? Thank you for your help.

[Robert_LeClair]

While in the Layout View, on the Layout Tab, click Activate in the Map group.  AGP transitions to the Map Tab.  From the Map Tab in the Layer Group, click Basemap and change your Basemap.  Lastly, towards the far right on the ribbon, click Activated Map Frame (Layout) and click Close Activation.  Basemap updated.