Tooltip - Remove auto title

Hi all,

Long time forum reader, first time forum poster.

In the process of a Tableau to PBI migration and feel like I'm losing my mind 😞

There's a squillion things I could ask about but I'm going to start with something (that should be) easy.

Is there a way to edit/suppress/remove the automatic title on a tooltip for a line chart.

eg. in the sample attached, the '9' refers to week number (which is on my X-axis)

Is there any way to do anything with this?  I notice that tooltips for column charts behave differently (ie they don't have this auto heading or whatever it is) 

Thanks in advance