On my macbook, the dock is always standing at the bottom, since I never want to use the option "automatically hide and show". On High Sierra, the dock's presence would not interfere the display of the bookmark. Even if there are a long list of entries in the bookmark, it would not be blocked by the dock. However, after my macbook was upgraded to Mojave last night, the dock would block the bottom entries of the long bookmark list. Wondering if there is any fix for this…
Screenshot with dock "auto hide and show" disabled:
Screenshot with dock "auto hide and show" enabled
Update:
After a few days, without anything being done, suddenly the problem disappeared. Please look at the following screenshot. I don't know why, but it is good to see the bottom of the bookmarks no longer being blocked by the dock.
Best Answer
You might try moving the dock to either the left or right sides of the screen, rather than the bottom: System Preferences > Dock > Position on screen.
In the same Preference Pane, the size of the Dock can also be adjusted with the topmost "Size" slider.
(This is in macOS Mojave; might be different in other versions)