These settings let you control how code completion is activated. To edit your code completion settings:
On the Edit menu, select Preferences submenu.
Select Editing Window on the tree view of the Preferences dialog and then select Code Completion.
Ticking this check box turns on code completion.
If selecting this option, the code completion will only be activated when <CTRL> + <SPACE> is pressed.
If selecting this option, code completion will be activated whenever the opening brace ('<') of a tag is entered.
If selecting this option, code completion will be automatically opened after a set delay whenever the cursor is inside a tag.
You can use the two drop-down lists to specify the way the code completion appears when you edit.
This bar selects the time delay before code completion is activated within the code completion.
Selecting this option automatically closes tags when the first opening brace ('<') is entered.