I have a small suggestion for LeetCode. As we all know that in a real interview we have only 45 minutes to solve a problem. I suggest LeetCode to add timer in problem UI to track our time, so we will not spend more than 45 minutes on one problem or we will know how much time we are taking to solve a particular problem. It will also be helpful to practice the speed to solve problem. It can be something like you start timer when you start a problem then you have 40-45 min to finish the problem.
Also add average time(Average time of solveing the problem), so that we will know in what time others are solving this particular problem.