arduino 1.8.10 Serial plotter legenda unstable


As win 10 user and arduino rev. 1.8.10 I noticed a difference in the use of the serial plotter.
Former revs. in the serial plotter the line,w where indicated with a collor in the left top corner by means of a square and where steady no text whatsoever.
In 1.8.10 the collered dots (square) are switching between (????) it looks like the file name or something like that.
In any case they are not stable/fixxed?

Is the a bug?
Is there a possibility to adjust the parameters ??

Like to hear.

Kind regards,


After a close look it looks like the date is the serial.print lines in the script.
So the serial.print liners are printed in the plotter legenda line???