
Hi, @M S ,
The "icons" are simply generated by SharePoint Column JSON formatting. We can use it to customize how the columns look like.
In SharePoint Online now, when you create a new column (like choice column), you can directly choose some basic formatting. And when you click the column header, navigate to column settings>format this column. You can apply JSON formatting to edit the style, adding conditional rules via UI or with JSON code directly. You can try with the UI approach by yourself.
For more information, you can check these docs:
https://support.microsoft.com/en-us/office/column-formatting-1f927342-2bed-4745-b727-ff8b7ff96b22
https://learn.microsoft.com/en-us/sharepoint/dev/declarative-customization/column-formatting
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