PCB Design for Rocket Flight Computer

If I am routing a via on the top signal layer, then I want to flip it to the bottom layer (signal) what is the keyboard shortcut to flip it from top to bottom layer? This is a 4 layer board where the middle layers are power.
The most relevant entry I found related to switching layers while routing says:
Routing Across Multiple Layers
To switch layers while routing a trace:
  1. Hover over the target component's pad until a green dot appears
  2. Click on the green dot to begin routing - the trace will follow your cursor on the currently selected layer
  3. To move the trace to a different layer, right-click and select the target layer
  4. A via will be automatically placed, connecting the two layers
  5. Continue routing on the new layer
Image

Image

Check routing layer shortcut
Confirm no hotkey exists
Route via through power layers
Find shortcut list

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