Hi akountables-uk-g Thanks for reaching out to us here on the Community. The reporting financial year dates are set to run from the first day of the month that has been entered in the first month of the financial year settings, it's not possible to alter this. It is possible to run reports for a shorter period as long as the start and end dates don't overlap the financial year. Therefore what you could do is run two reports that would cover the periods you require; using the custom date option, one report from the 06/04/2023 - 31/03/2024, run the second report from 01/04/2023 - 05/04/2023, export the reports and merge them together.
We've submitted your feedback to our developers and hopefully in the future they maybe able to implement a more robust reporting function that would enable customers to enter their own financial year dates.