https://wccftech.com/download-apple-releases-beta-5-of-macos-big-sur-11-3-tvos-14-5-and-watchos-7-4-to-developers/

Today, Apple has seen fit to release beta 5 of its upcoming macOS Big Sur 11.3, tvOS 14.5, and watchOS 7.4 to developers for testing purposes. If you are a developer and want to test the new beta builds, you can download them right now on your compatible Apple devices. The new beta builds arrives a week after the company released beta 4 to the developers. Let's dive in to see if Apple has added a new forward-facing addition to the table.

Starting off with macOS Big Sur 11.3, beta 5 can be downloaded on your compatible Macs using the Software Update mechanism in System Preferences. Make sure that you install a proper configuration profile from the Apple Developer Center. macOS Big Sur 11.3 is a major update pertaining to the number of features it will bring to the mix. For instance, the build will bring customization tools in Safari, optimizations for using iOS apps on the M1 Macs, and Controller Emulation.