I suppose you mean the MFD at the left ?
If so ... just assign a button to toggle this MFD .... as you might need it for pitstops.
There are different choices as for example
- ranking in race
- ranking position on track
- pitstop .....
And the last one before restarting from the 1st one is .......... fully invisible.
With an assigned button you'll be able to have the pitstop window opening when entering the pitlane or you'll be able to toggle this MFD to let it appear on track when needed.