Shape default discrepancy

I am running Office 2016, on a PC running Windows 11 24H2 and 26100.4484

In one spreadsheet, when I try to draw a line, or insert any shape, it draws 3 black lines parallel to each other, and on another spreadsheet, it just draws one blue line (which the other spreadsheet used to do)

I'm assuming there is a "default" (the single blue line), but I have been through all the settings:

Solid Line

Width 0.75

Compound type = Simple

Dash Type = Solid

Cap type = Flat

Joint type = Round

(No arrows)

 Lines.jpg   10.37KB   0 downloads

Any idea how I can get rid of the multiple lines as the default (as I'm assuming it's reset the default somewhere)

I just want the single blue line as the default.

or will I have to reinstall Office ?

Thanks

Edited by davec1510, 03 July 2025 - 06:10 AM.