Magento ver. 2.3.5-p1
The base currency is set Indian Rupee everywhere in stores configurations->General->Currency setup.
Currency symbol is $ in Refund column of Credit Memo even if base currency is set different. At all other places it shows correct currency symbol.
This issue is already added in magento issues on github. Please find the link below, You can get the fix from it.https://github.com/magento/magento2/issues/25003Thank you. Hope this will help you.