To simplify this workaround,

1. Right click on blank screen of redux dev tools.
2. Open inspect tab
3. Open Application tab
4. In left Pane, click on IndexedDB
5. Inside IndexedDB, click on any link
6. Click "Delete Database"

Now close all the inspect tabs of the browser an reopen projects redex dev tools again.
Now you must have came to normal screen of redex devtools.

Done.