Which version of the software? In some circumstances this is deliberate, it is to indicate to the user that the net inherits the global signal name, usually where it overrides an already named net where the name is invisible. Though testing with VX.2.2 I cannot get the situation where the visibility changes with the net name inheritance, so the behaviour may already have changed.
Running latest VX.2.2 update 1
Well we are seeing it do this when you have a few a few pins you want connected to ground
but just connect then together first, then add the gnd symbol, it will add a net name to connection line.
Gotta say it is very annoying!!!
There isn't a way to disable this though you can probably avoid it by adapting how you connect the Tap (power/ground) symbol. If you draw the net to connect to the symbol it will show the name, if you move the symbol to connect with the net it won't (at least in my quick test). make sure there is a stub to connect to.
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We experience the same unwanted behavior on VX2.2 u4.
Maybe Robert, you can add this to a VX feature improvement list without opening a dedicated idea for this small issue.