You can control the number of words typed before the channel bar will appear. The channeling bar will appear only if the number of words typed in the widget is greater or lesser than a specified number.
You can do it by adding a new type of condition to the channeling policy:
Go to Channeling => Policy => click on Add channel => At the opened window name the new channel condition and add a condition according to the Screen shot below:
1. Choose the condition "Number of words".
2. Pick from the drop down the condition you prefer according to your needs ('Greater than', 'Equals to' or 'Less than').
3. Add the number of words.
4. In the action section 'After channel added' choose whether the channel bar will continue or stop processing.
4. Click on the 'Save' button.