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You are probably talking about the color bar layer. The color bar is a raster image layer placed on top of a raster image of the scene. If the number of pixels in your cropped image is small, then the color bar will be blurry because of the low resolution. You can export the color bar as a file, in which case you can specify a file size and the labels won't be blurry in the exported file.
Thank you for replying on my previous query. I have exported color bar as you have told and it worked but I am unable to export a map with clear color bar as attached below. Need your guidance.
Your image does not contain enough pixels and this is why the color bar is blurry. You need to export the scene and the color bar as separate files. You can then assemble them together in PowerPoint or some other software if you wish to display them without resolution issues.