Hi Tom,
Control+Up and Down arrow will adjust the height of a selected track. If multiple tracks are selected, it'll apply the change to all of the selected tracks. Be aware that tracks will change relative to each other. This means that, if various sizes are present, they will all change in tandem relative to each other. Therefore, it's a good idea, for example, to press Control+Up Arrow a bunch of times. This will ensure that the track heights all reach the biggest size which is "extreme." Then 3 pressess of Control+Down Arrow will bring the size of all selected tracks down to "medium."
The other method would be to select the tracks and, in the Edit window, interact with one of the selected tracks and Option+Shift+click on the first control and choose "medium" from the menu. Alternatively, you can also just Option+click to set all tracks to that height as well. If you use flo Tools, turn Flo Mouse on with Command+Forward Slash and you can easily perform modified mouse clicks which VoiceOver doesn't support natively. Pressing modifiers along with the Tilde key (below the escape key) will issue the mouse click.
HTH,
Slau
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