When your Switch is online in the dashboard, and you change the IP in the dashboard, you do not need to be on site to see this. The dashboard will show you the static IP and you can be sure it has been changed.
If your routing is correct, you will be able to ping the new static IP of your switch from remote computer.
Dashboard normally is always able to ping - not if offline 😛
I made the expierience that it may take minutes or even hours until it has been changed, from time to time. Don´t know why this is happening sometimes.
Last time I had this was last week. Changed IP from dhcp to static and it did not change for over an hour. Then I was done for the day, came back the next morning and all was fine.