Bar Chart Legend Customize Colors

Hi,Anonymous .Thank you for your reply.
The color setting of the bar in the bar chart is related to the number of fields you put in the vsiual.
When you store one field, you can set the color of the bar uniformly for the entire visual

When you place multiple fields (including some measures) on the x-axis of a bar
In this case, you need to select the corresponding modified field first, and then set the color of the selected bar.

Are you experiencing color inconsistency with the selected value after modifying the bar? You can try to use another version of Power BI Desktop to see if similar problem occurs. (Please provide the version of Power BI Desktop you are using.)
Links to download historical versions of Desktop
Previous monthly updates to Power BI Desktop and the Power BI service - Power BI | Microsoft Learn

Check if your issue is similar to the following issue, currently there is a temporary issue for incorrect report Theme on Power BI Service.
URL:
Solved: PowerBI desktop theme no longer being applied in t... - Microsoft Fabric Community
If there is any error in my understanding of the issue you are experiencing, please correct me promptly and attach the necessary screenshots of the demo.
Would you be able to reproduce your issue through the pbix file I have provided, which would be more helpful in resolving your issue.

Looking forward to your reply.