If you want your mobile doesn't remind you when you log-in on desktop client, you can go to your DingTalk mobile app [Messages]- find and select [Logged on Desktop], and turn on [Disable Mobile Notifications]. And when you log-off from desktop client you will still receive reminding to your mobile device;
If you want your DingTalk doesn't remind you at desktop client as well, you can press your profile photo on desktop client, and select [Settings] - [Desktop Notification] to set.