Cannot find 'Replace in Selection' button in Find/Replace UI

Problem

The 'Replace in Selection' button is not visible in the Find/Replace user interface of IntelliJ IDEA:

Cause

In recent updates of IntelliJ IDEA, the 'Replace in Selection' functionality was moved under the 'Filter' button.

Resolution

To use the 'Replace in Selection' feature:

1. Press Ctrl+R/Cmd+R or go to main menu -> Edit -> Find -> Replace to open the 'Find/Replace' window
2. Look for the 'Filter' button in the interface.-
3. Select the option for 'Search in Selection' from the dropdown menu presented there.

Additionally, users can quickly activate the 'Search in Selection' mode by pressing Ctrl+R/Cmd+R twice.