conditional formatting "ok" button not activated

Hi Dellis81 

As below are three options in conditional format:

1.Color scale
Based on the measure/summarized column numerical value

2.Rules
Similar to color scale, but with a specific color for each range of values

3.Field Value

You can use color code values from the data model itself!

You may refer to this blog for more details: Conditional formatting by field value in Power BI

I try to use measure in color scale like yours and I could select "OK' botton. My measure return to Decimal number as well.

Here I have some advice.

1. Please check whether your desktop has the latest version: Version: 2.87.762.0 64-bit (Nov 2020)

2. Please check the type of your measure.

If all is correct, please provide me a sample like yours or share your pbix file by your Onedrive for Business with me.

Best Regards,

Rico Zhou

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