Change of field type is not possible.
Create a new field, transfer the data using "Mass data update" (Gear icon menu) from the old to the new field.

See here: https://ninoxdb.de/en/manual/tables/mass-data-updates

Birger

Currently there are no plans to change this. Birger

+ 1 - It would improve usability a lot if you are able to change the field type

The link https://ninoxdb.de/en/manual/tables/mass-data-updates  is no longer valid.

This one does:

https://ninox.com/en/manual/tables/update-multiple-values

Steven

The link https://ninoxdb.de/en/manual/tables/mass-data-updates is no longer valid and there's no element named "Mass data update" in the Ninox UI.

Use the "Update multiple records..." option from the gear option.

[I tried to add a screenshot buy the image upload feature does not work.]