As part of the 262 release, Salesforce migrated Field Service mobile from the legacy React Native implementation to a fully native architecture. This brings faster load times, richer offline data access, fewer crashes, and a more consistent UI — picklists and lookups now align with standard record edit controls.
As a result, the long text area fields now open in full-screen mode when editing, within the Field Service mobile app. This is expected, intended behavior under the new native architecture.
For more details, see the release notes: FSL Mobile Native — Release Notes
005390611

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.