It&#x27;s a fermata on the second beat of that measure. Holding a note doesn&#x27;t mean you&#x27;re changing the time signature.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Fermata" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Fermata</a>