You can now preview your LinkedIn posts with perfect accuracy.
Click on "Publish" or "Schedule" and then click on "Preview" (next to the LinkedIn toggle) to see this new Realistic Preview. This gives you a precise idea of how the post will look on LinkedIn.
The post is collapsed by default (as shown on LinkedIn) with the "See more..." button available to expand it.
To optimize your posts for mobile, click on the "Mobile" toggle in the top right corner to see how it looks like on people's phones.