I have to admit that I find the UX of the contact very cluttered compared to other CRM (like Pipedrive).

Tons of information don't serve me.
And I have a hard time with the color code. Why so many colors with no meaning ?

I would suggest to:
_ Be able to really chosse which information iare displayed on the contact screen
_ Use more wisely all the space you have on the screen : why contacts information is stuck in such a small place on my screen, whenever I open it directly as a contact or from the workklow screen for instance ?
The history of the contact is so difficult to read.
Same for the calendar that is ridiculously small.
_ Put only colors when it has a meaning
_ Use softer colors.