Panel Param change in .visible property is not applied

Panel
2

In your code params.widgets['k'] returns the widget class that you’ve defined in pn.Param(...). You need to modify the widget instance, to which you can get a handle on with params.layout[2] (it’s the third widget, after the title and the dataset widget).

@pn.depends(dataset=data_params.param.dataset, watch=True)
def show_widgets(dataset):
    print('Hey', dataset)
    if dataset == 'Data 1':
        params.layout[2].visible = True
    else:
        params.layout[2].visible = False
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