Hi Joe,
Check this page of the documentation:
https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/vector_properties.html?highlight=toolbars#the-label-toolbar
You need to set the labels for all the roads (font type, color, general
position, and so on). Then, The show/hide button allows you to hide the
labels that you want or force show them. For the functionality like you
want to can use the hide option drawing a rectangle around all roads to
hide all labels, and then selectively click the road to show the ones you
want.
Hope I have helped.
Best regards,
Alexandre Neto
User Support
www.qcooperative.net
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