app.py

import gradio as gr

max_textboxes = 10

def variable_outputs(k):
    k = int(k)
    return [gr.Textbox.update(visible=True)]*k + [gr.Textbox.update(visible=False)]*(max_textboxes-k)

with gr.Blocks() as demo:
    with gr.Row():
        with gr.Column():
            s = gr.Slider(1, max_textboxes, step=1)
        with gr.Column():
            textboxes = []
            for i in range(max_textboxes):
                t = gr.Textbox(f"Textbox {i}")
                textboxes.append(t)

            s.change(variable_outputs, s, textboxes)
    
demo.launch()