Yes, yes !
If unnecessary tabs are left, they will lead to reduced visibility and should be erased if possible.
The line chart will work fine even if the tabs that do not need to be displayed (Data1 & Data2) are deleted with the X button.
Just in case it helps.
In the following Q&A, I displayed a line chart visualization using the same data.
Line chart: about splits and color - Community (datagrok.ai)