Is flip along missing?

I haven’t used Sketchup for a couple of weeks. While moving a part recently I wanted to flip it along the red axis, but the “flip along” choice was missing when I right clicked the mouse. That is how I did it in the past. I found a flip choice in the move menu. Is this the new way to flip an object?

I’m using the free version of Sketchup for web.

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Yes. Have a look at this help section:

Assign a shortcut key to this tool to make modeling life easier. Also look at the status bar down left to see the options.