Regenerate question codes
From LimeSurvey Manual
The users that have the permission to edit questions can allocate a unique ID to any survey question. However, if these IDs differ too much (the numbering is too messy), the Regenerate question codes function can be used to automatically rename the survey questions:

The numbering can be:
- Straight: If this option is used, each question will be allocated a code that corresponds to their order from the survey structure (e.g. Q00001, Q0002, etc.);
- By question group: If this option is chosen, each question will be allocated a code that corresponds to the group each of them belongs to and their order within that question group: (G1Q00001, G1Q00002, G2Q00001, etc.).