You can format settings for fonts, alignment, shading, borders, lines and tooltips at the worksheet level, however, sometimes Tableau doesn't do what you think it should.  In this video, I show you some quirks with formatting.

Format Worksheets in Tableau - Comprehensive Tutorial for Beginners: https://www.youtube.com/watch?v=0pursdur27A

Timestamps
00:00:00 intro
00:00:12 Origin of this video
00:00:57 The best formating video on tableau anywhere
00:01:30 The problem
00:02:09 Formatting issues in our chart
00:03:06 Change formatting metadata at a data source level
00:07:46 Columns and rows in formatting
00:08:49 Fomratting pane options
00:11:03 Change the colour of the header
00:15:32 Sometimes formatting gets buggy
00:15:41 Formatting Bugging out
00:21:00 Table formating
00:28:35 Other thoughts
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