Option to hide equal-sign icon in formula cells

[dcnadler]

Describe the problem to be solved

When a summary table is very dense, the equal-sign icon in each cell can take up a significant fraction of space and clutter the view. For example:

Describe the solution you would like

A column property that hides the equal-sign icon.

The indicator can be helpful when drafting/editing, but once it's a completed dashboard the indicator is not helpful. This is especially true for Viewers who can't edit the document, but the icons still show up for them.