Hi Adam,
Your first question is: How do you turn off fields in a AGOL View Layer?
The answer is: You don't set this on the Data tab, but on the Visualization tab instead.
On this Visualization tab, click More Options (the dots) and in the menu choose Set View Definition > Define Fields (see screen capture
Define the fields that will be available in this layer. Unselected fields are completely hidden to others. If the field is grayed out in the list, its visibility can't be changed.
In this dialog you can also check/uncheck all fields at once by clicking the checkbox next to Field Name.
Your second question is: How do you change symbology in a AGOL View Layer?
The answer is: you are on the right track. I tested this on my view and it works for me.
So, I don't know why you get an empty drop down list... 😞
- Can this be caused by the large number of fields in the service (you say "hundreds of fields")?
- Can you please check and try to change the symbology on the original feature layer the view is based on? In this way you can establish whether it actually is an issue on the view layer, or on the featureset as a whole.
- Does the issue still occur after you have limited the number of fields to 10 (see step 1 above)?
Please keep us posted.
HTH,
Egge-Jan