Lightroom Classic V10.1 - Adobe

: The Caption field in the Metadata panel is designed to auto-resize to accommodate long text blocks, unlike the fixed-size fields used for other metadata.

Adobe Lightroom Classic version 10.1, released in December 2020, includes several features and fixes related to handling "long text" or text display in general: Adobe Lightroom Classic v10.1

: You must restart Lightroom for these font size changes to take effect. : The Caption field in the Metadata panel