The search does not work when searching as Administrator, I wait for it one minute and it shows nothing, it takes only few seconds to show the search result at normal mode.
I'm afraid Dolphin 23.08.5 is unfortunately no longer eligible for support or maintenance from KDE. KDE projects typically move quickly, and bugs in one version are often fixed in the next one. Please update to Dolphin 25.04.2 as soon as your distribution offers it to you, or use other application distribution methods such as Flathub. If you need support for Dolphin 23.08.5, please contact your distribution, who bears the responsibility of providing support for older software in their "long-term support" releases. If this issue is still reproducible in Dolphin 25.04.2, feel free to re-open this bug report. Thanks for understanding!