Can I cancel my expired Non-O extension and apply for a new visa while my spouse remains in Thailand?

The user is facing a situation where they have a one-year extension of a Non-O visa as a trailing spouse but need to leave Thailand suddenly without canceling the extension. The user inquires about the possibility of returning to Thailand on a new long-term visa and whether they can cancel the old extension upon reapplication. Comments suggest that if the extension expires without cancellation, a fine may apply, but it's generally easier to manage if handled properly. It's possible to cancel the expired extension and apply for a new visa later; however, keeping documentation is recommended to ease the process.