how to hide the progress bar / +10 -10 buttons

[liuchenc]

Have been troubled for a long time

[shen601020]

There is a customControls property that allows you to define your own control UI. You can create a custom control by removing elements like the progress bar and the +10/-10 buttons.
Take MaterialControls as an example — it contains a method called Widget _buildHitArea() {}, which is where the +10 and -10 buttons are defined. You can simply remove those components from this method to exclude them from the UI.