there is the option in LayTheme to add a horizontal which is great.
Could somebody help me to customize the line thickness. I tried it in the customize section with .hr but couldn´t make it work.
Horizontal Line Style
In the gridder, select 'More' and you will see an option for "Horizontal Line' - you can then add it anywhere in the gridder.
To change the line thickness go to 'Lay Options' - 'Lay Options' and under 'Horizontal Lines' you can set the horizontal line height.
Hope that helps,
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