Is there a limited number of features for QSVM in Qiskit-Aqua?

Why all tutorials that use QSVM from qiskit Aqua library have the number of features equal to 2?

Thank you!

Here is a tutorial that uses three classes! If you want to use more than two classes, you need a multiclass_extension which is provided as a parameter to the QSVM
svm = QSVM(feature_map, training_input, test_input, total_array,