Wanna divide {ONLY Straight Line} button from {Square,Triangle,Circle} button because whenever I write / before conjunction or kinda adverb, it always becomes curve.

Also, that suggested {ONLY Straight Line} button needs to include Highlighter, too. Because that Highlighter's straight option does not works well and it highlights as curve. But my book in PDF does not curved.

I want to study in a effective way with fast writing straight lines instead of drawing fine art curve. But currently, Goonotes5 on iPad enforce me art on my textbook PDF.

So JUST make {ONLY Straight Line} button including pen and highlighter.