Disable scroll between websites in Safari Reading List

Unfortunately, no.

Usually there will be an UP button at the right bottom corner to go to the top of the page fast.

Please submit a Feedback to Apple. Feedback - Safari - Apple

Just to find a word, user can use the Find menu.

Click Edit in the Safari menu bar ,move down to Find and then Find.

Enter the search term in the box at the top right corner.

Number of matches will be shown

Press command + shift + G to navigate from one word to the next.

As far as I’m aware there is no user option to disable this behaviour.

Workarounds:

1. Open in a new tab or window. Control-click a page summary in the Reading List sidebar, then choose either Open in New Tab or Open in New Window.

2. Use the keyboard or scroll bars for webpage navigation. Use of either method with prevent transition to the next Reading List page. Useful webpage navigation keyboard shortcuts:

Scroll up, down Up Arrow, Down Arrow.

Scroll in larger increments Option + Up or Down Arrow.

Scroll down a screen Page Down or Space bar.

Scroll up a screen Page Up or Shift + Space bar

Scroll to page top Command + Up Arrow or Home

Scroll to page bottom Command + Down Arrow or End