The ability to have symbols whose size adjusts based on the zoom level. For example, a square symbol representing a tile grid cell that scales dynamically with the zoom, so that it remains proportional to other displayed elements at any scale.
If I understand your request, this is very achievable using ArcGIS Pro. There are a few different workflows, depending on if you would like to set the dynamic scale for a layer or rather a specific feature layer.
To set the dynamic scale for an entire layer, simply navigate to the layer in the contents pane > Right-click > Properties > Under Properties pop-up, select General and you'll see Visible Scale Range (choose 'Show layer between these scales only). Then specify the Maximum and Minimum scales.
Lastly, if you have a layer with 'Unique Value Symbology' and you want a specific feature to dynamically scale
Lastly, if you have a layer with 'Unique Value Symbology' and want only a specific class/feature to dynamically scale choose Format Symbol > Properties > Symbol > choose 'Enable scale-based sizing.' From there, you can customize the size of the symbol at multiple different zoom levels. I'll share a video below for easier understanding. arcgis-pro-tips-scale-based-symbol-sizing
Cheers!
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