Hi @GarrethX,
This is a known problem.
There are several other topics on this, please up vote this:
https://forums.flightsimulator.com/t/toolbar-missing-and-ability-to-change-certain-weather-settings-missing-when-loading-a-saved-flight/342575/11
There is also one in the wish list, please up vote this:
https://forums.flightsimulator.com/t/time-and-weather-changing-ability-after-the-saved-flight-loading-and-during-it/334679/12
And the most important is to submit a zendesk on it at:
https://flightsimulator.zendesk.com/hc/en-us/requests/new
Since your topic is a duplicate, I am going to close it. Having a duplicate topic hurts vote counts. You can contribute to either of the 2 I listed above.