What is the indexedDB folder for and how to keep size small

Been using Brave on this PC for three days.

C:\users\profilename\appdata\local\brave-browser\default\indexedDB folder is already over 1GB, and contains folders named for the websites I visit.

Clearing cache and downloaded items doesn’t affect this folder

How can this folder size be reduced, please? Is there a setting to manage this folder, or even opt out of this behavior altogether?

[Version 1.0.1 Chromium: 78.0.3904.108 (Official Build) (64-bit)]

Anyone have any useful info to share?