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Why does a command not auto-complete

First, check if TeXStudio know the command.

A command is know, if it is not underlined with red squiggly lines.

See Valid Commands for more details.

Known

To reduce overcrowding, TeXStudio does not
include all commands in the typical tab.

More precisely, all commands from auto-generated
.cwl files are by default only visible in the all tab.

Check if the command appears in the all tab of the completion.

To change this default behavior of a command,
simply edit the corresponding CWL File.

Unknown

If the command is unknown, the solution is to write a CWL File
defining the command and putting it in the Settings Directory.