I use the following method on my Surface Pro tablet when I want to select non-consecutive rows. First, I mark all the rows I want to select with Mark Books, then choose "show marked books". Now only the marked rows are visible. Then I open the virtual keyboard, tap Ctrl, tap Select all. All the rows I wanted to select are now highlighted.
When I want to select consecutive rows, I often use a search term. For example, format:mobi, or cover:false, or date:>2018-12-5, etc. etc. So again, only those rows I want to select will be visible.
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