What is preventing you from having a panel whose search includes an earliest=-24h clause?
eg the search might look like:
index=ndx sourcetype=srctp earliest=-24h
<rest of search>
from User warren – Stack Overflow https://stackoverflow.com/questions/68938841/changing-panel-time-for-splunk-dashboard-studio-irrespective-of-the-global-timin/68942819#68942819
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