There are two alternative styles for headings and subheadings:
▪Caps and lowercase style
If you have a company style guide that dictates capitalizing headings, follow this style. If you’re free to choose, use sentence-style capitalization, which is more modern and easier to use.
Make sure that your headings are formatted so that they can be clearly identified as headings (see Designing: ).
Apply the same rules for figure titles and table titles (if you have any). However, always use sentence-style capitalization for figure callouts, for texts within figures, for table row headings, and for table column headings.