Asia/Shanghai), it opens a “Local Settings Suggestion” dialog with a button to switch. Do not press that button — choose “Dismiss” on the left instead.
The reason is that switching breaks the Call Data Overview chart at the top of the Logs page: the time buckets no longer line up with the chart range, so the data looks missing or shifted. Keep the account timezone at its default London (UTC+0/+1) — that is UTC+0 — and the chart renders correctly.

The Local Settings Suggestion dialog — choose 暂时忽略 (Dismiss) on the left
London (UTC+0/+1). If you already switched by mistake, setting it back restores the chart. Timestamps in the log detail list still follow the account timezone, so convert from UTC+0.
The two export paths on the Logs page (Export and Billing Summary) use different timezone bases — see What should I know about log timezone settings and data export?.
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