Hi @Даниил260879784iee , You would use the Baseline Grid options when you want a Text Frame’s Baseline grid to be different than the document’s Baseline Grid, which is set in Preferences>Grid. Also, the Text Frame’s text would not align to the custom grid until you select the text and set it to Align to baseline grid in the Paragraph or Paragraph Styles palette.
Here my document‘s grid is set to 10pt, and my Text Frame’s Object Style is set to 16pt:

The text does not align to the custom baseline grid until I check Align to baseline grid in the Paragraph palette. When the the text is set to align to the baseline the First Baseline settings are ignored:

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