Just like automatic tempo matching functions in the Arrange area, the Functions > “Adjust Tempo by Selection and Locators” command adjusts the project tempo, in accordance with the current locator positions and selected area in the Sample Editor.
Although this operation is similar to the Arrange function (see Setting the Project Tempo to Match an Audio Region), it applies only to the selected area of the audio file in the Sample Editor, rather than to the overall length of the region.