Just checking out Sequoia Pro 17 and was astonished to find that markers do not appear in the midi editor. Have I missed a setting that I should tick/untick or have you removed that? Markers show up in the Midi editor on Samp pro-X8
Can I recommend you repost your question to the dedicated Samplitude/Sequoia forum here since there are very few users of Sequoia who visit and post to this forum?