What are Experiments?
We call an individual training on a dataset "Experiment". Thus training your model on the competition dataset creates an Experiment connected to the corresponding competition.
You can only submit models to a competitions leaderboard that were trained on the competition dataset.
The Experiments you created on a specific competition can be found at that competition by clicking on the "Experiments" tab.
Alternatively, you can switch to the "Experiment View" to see all the experiments you ran on different datasets:
The Experiments on Datasets marked with the "Competition" Label belong to competitions.