Thanks for the reply
“The picture you use is very small (1000px x 469px) that’s why it does not cover the screen.” ok. I will look at increasing the size but this was downloaded in the demo content so I haven’t touched this.
“WP admin -> Appearance -> Allslider, open the settings (gear icon), there you can change the headlines for the slides” I have found this and updated for the current home page. are you only able to update the current home page Allslider as “Home + Parallax Header” is not my current home page.