Good morning @mdevaney and @MarvinBangert ,
Thank you for taking the time to respond to my question.
I have changed the SPList to number with 2 decimals and added the following as Default: Text(ThisItem.Bedrag, "[$-en-GB]# ##0,00", "en-GB").
It displays the number without any decimals like this, 2,433. I am looking for 2 433,56, with the comma as the decimal.
I kept the SPList on number with 2 decimals and changed Default: Text(Parent.Default, "[$-en-GB]## ###,00"). On the Edit Form it is displayed as 2,434. When I go back to the Detail Form it is displayed as 2433.56. The settings on the Detail Form and the Edit Form for that field is the same.
I went back to the Site Settings in SharePoint and changed it to English (UK) but the results are the same.
On the Android phone it displays the edit form as 2 434 but without any decimals but the Detail Form displays it as 2434,56.
Oh, I refreshed the data sources every time I made changes.