[iterm] How can I scroll up more (increase the scroll buffer) in iTerm2?

Silly question, so I do apologize if the answer is bluntly obvious but how can I scroll up more on iterm2 to get full output? At times, for example if I am doing unit tests, the errors are so large than I need to keep scrolling up to which I cannot scroll up anymore but the output continues further up beyond the top of the scroll. How can I access that? I tried page up more but not getting me there.

Thanks!

macOS default termianl

macOS 10.15.7

1. open Terminal
2. click Prefrences...
3. select Window tab
4. just change Scrollback to Limit number of rows to: what your wanted.

my screenshots

Solution: In order to increase your buffer history on iterm bash terminal you've got two options:

Go to iterm -> Preferences -> Profiles -> Terminal Tab -> Scrollback Buffer (section)

Option 1. select the checkbox Unlimited scrollback

Option 2. type the selected Scrollback lines numbers you'd like your terminal buffer to cache (See image below)