By default, when you publish a widget, WordPress will show that widget on every page, so you need a plugin to control what pages gets that widget. Normally I use and provide a quick tutorial about a plugin called Dynamic Widgets, but I just found another one that seems to be easier to use for people. This one is called “Display Widgets”. It adds a selection method of pages on every widget so you can choose where that widget will be seen. This is how you can show the slideshow on just one page, such as the front page.