A line under the slide headers is analogous to a secretary of HiPU. Do not underline the slide header. It populates the slide with unnecessary noise. In fact, underlines must be avoided not only in headers but also in the body text.
The following set of tools detects this smell: SlideQ(for MS Powerpoint Presentation)
T. Sharma, “Presentation Smells: How Not to Prepare Your Conference Presentation”. 2016.
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