If you press "Enter", it just inserts into autocomplete, if you press "Tab", it will replace it. I would suggest that you always press Tab, so try Enter and see if you like how it works.
Complete Documentation from JetBrains
Here TL; DR;
- Use Enter to insert the selected row at the insertion point.
- Use the tab to replace the row next to the carriage with the selected one.
- Use Ctrl + Shift + Enter to make syntactically correct code construction (brackets in brackets, add missing curly braces and semicolons, etc.).
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