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Chasing down why changing text size properties does nothing, I found in the File>Setup options a fly-out note that text size doesn't work on the "Default" font. However it does work on "stick" and "Times". If you have an imported layout with illegibly small texts (mine show tiny and don't scale, as-opened) try changing the font, the texts may resume their original (exported / property) size.
It's difficult to select texts by click, you have to find the origin. Drag-select is better. I am having trouble moving a selected text, using the banner "Move" icon the "from" click (if you were moving, say, a polygon or instance object) instead deselects the text and selects some other object under the click-point. However the keyboard arrows will do the right thing. There is something odd about text object move / select / reselect behavior.
I could not find a settings option to force display of text origin. Depending on justification this may not be where you think it is, relative to the displayed body of the text, and point-selection needs you to hit the mark pretty exactly.