https://wccftech.com/optional-windows-update-is-available-for-21h1-20h2-and-2004-fixes-gaming-performance/

Microsoft has today released non-security, optional updates for its latest Windows 10 May 2021 Update (version 21H1), October 2020 Update (version 20H2), and May 2020 Update (version 2004), all of which share a common core operating system. Preview Windows update KB5003690 (Builds 19041.1081, 19042.1081, and 19043.1081) is now available.

"The June 2021 non-security preview release, referred to as our "C" release, is now available for Windows 10, version 21H1 and all supported versions of Windows," the Windows maker said. This update was earlier released for Insiders in the Beta and Release Preview Channels, but now users can also install this optional update via Windows Update and Microsoft Update Catalog. However, we don't recommend installing these optional updates right away as Microsoft includes these fixes with the mandatory cumulative updates of next month's Patch Tuesday.