I open a landscape from Add…then Mesh…then landscape…then I move the mountain to the center of the grid…after that I can no longer access any landscape tools to make adjustments to the mountain…they are greyed out or disappear…what am I doing wrong…
The operator panel shows settings for the previous operator. You moved it, which is another operator, and it shows the options for that one. For it to show the options, you would have to call the same operator again. It does remember the settings so that is one option.
The landscape option is an addon. Some addons provide properties for objects outside the operator panel. ANT Landscape has those on the 3d view properties.