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Daniel answer with 2 changes worked for me with child account.
Add --disable-features=msUndersideButton
as an additional argument in shortcut target field. Note --dis instead of -dis....
AND
Disable "Startup boost" in Edge's "System and performance" setting.
From https://www.reddit.com/r/MicrosoftEdge/comments/10jccjy/remove_the_discover_purple_star_button/