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I don't know how th say it correctly. i probably made something in a sketch and i see no more the red dots at the ends of lines to snap to when i sketch. the on point small drawing appears on the screen so i can know if it "caught" it.
Check your Constraint Persistence
and
Constraint Options.
What version of Inventor are you using? (I would post screen shots of how to check both of these - but I don't know what version of Inventor you are using.)
The CADWhisperer YouTube Channel
Check here.
The CADWhisperer YouTube Channel