How to hide Complete button from Survey Preview Tab.

Hello Shubham,
Please review this example.
You need to turn off the complete button as the following:

JavaScript
creator.onSurveyInstanceCreated.add(function(sender, options) {
    //If we are creating a surface for "Test Survey" tab
    if(options.reason == "test") {
        const completeAction = options.survey.navigationBar.getActionById("sv-nav-complete");
        completeAction.visible = false;
        options.survey.onCurrentPageChanged.add((sender, options) => {
            completeAction.visible = false;
        });
    }
});

Here is the example.

Thank you,
Andrew
SurveyJS Team