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That behavior is completely "off-the-wall". You do not provide any background information to help anyone who cares to respond. For example, the SQL Developer version in use, database you are connecting to, third-party extensions you may have installed, etc.
If you just installed the latest production version (3.2.20.09.87) into a empty directory, had no prior version to migrate settings from, and connect to an Oracle database, then the behavior (with Tools -> Preferences -> Code Editor -> Completion Insight on by default) when typing "select * from u" should be to pop-up a list of possible table/view names to select from.
Please post additional details if you want help.
I changed the behavior of Completion Insight increasing the velocity of Pop-up.
Before it was configured to 0,3 seconds. But it seems strange to me, because I think that the auto-complete should not try to put a table name when I typing a 'select'.
But anyway, it works for me.
Now configure Completion Insight with 3 seconds and I have enough time to write the queries without the Pop-up appears for every letter.