Perhaps you could show a screen shot.
Sense is usually very quick to add its own horizontal scroll should the chart require it. Its not something it makes customisable due to its responsive layout.
In straight tables in Qlik Sense, a horizontal scroll bar does not exist. This is because of the responsive design of Qlik Sense to automatically resize objects and layouts according to the screen size. Users can choose sort orders and columns to display according to the screenshot in the previous post.
Please mark this response as helpful and correct if this helps.
If you want to add a horizontal scroll bar in a pivot table I recommend you to put your table in a container. Then you could use the scroll bar created by the container.