At the moment, setting Idle Disconnect time out for Azure P2S VPN is not possible from Azure end. However, you can configure the same at the client side. Here is a 3rd party document that explains how to adjust the Idle timeout for Azure P2S VPN.
I will also make sure to relay and request this feature to our Product Team internally. Hope this helps. Please let us know if you have any further questions/concerns and we will be glad to assist you further. Thank you!
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