1. Install and activate the plugin “Widget Logic” or “Widget Visibility”
2. Go to Appearance > Widgets.
3. Locate the search bar widget you want to limit visibility for.
4. Click on the “Down Arrow” button to expand the widget settings.
5. In the “Widget Logic” or “Visibility” field, enter the specific page or pages where you want the search bar widget to appear.
6. You can use the page ID, title, or slug to target the specific page. For example, if you want the search bar to only show up on the homepage, you can enter is_front_page()
7. Click “Save” to apply the changes.
8. The search bar widget will now only be visible on the specific page or pages you have selected.

Please note that the specific steps may vary slightly depending on the version of WordPress and the plugin you are using.

You can also use a plugin like “Widget Options” to have more control over the visibility and other settings of the widget.