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Currently it says that WebClient supports only one field to indent.
https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/properties/devenv-indentationcontrols-property#remarks

If you specify more than one field in IndentationControls property, they become concatenated into one semi-multilevel control with glitches.
It would be good to have controls behave normally - indent every field specified.
Category: General
STATUS DETAILS
Needs Votes
Ideas Administrator

Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future. Best regards, Business Central Team