Google updated the account switcher option in September last month, which is available in the top-right corner of Android apps. The account switcher option is now getting more Material You and Dynamic Color.
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The feature was first available in Messages with rounded corners and the “Manage your Google Account” button has now switched to a rounded rectangle.
According to the information, Messages — latest beta version: messages.android_20221208_01_RC00.phone.openbeta_dynamic — is the first to get a Google Account switcher with a Dynamic Color theme. You can join the Google Messages in beta from here.