The leverage for pairs containing Swiss Frank (CHF) has indeed been reduced from 1:500 to 1:50. This is due to changes made in it's margin requirements. The change will occur at 9PM Server time on 20th August 2021. There is no set date yet for when the previous leverage will apply to CHF pairs.
Any pair containing CHF will be affected. Some examples are AUDCHF, EURCHF, USDCHF etc. We highly suggest checking your account's margin if trades containing CHF will be left open past 9PM server time as advised above.
Some examples of how leverage will be adjusted:
1:500 accounts will be provided 1:50 leverage.
1:300 accounts will be provided 1:30 leverage.
1:100 accounts will be provided 1:10 leverage.
(The proportionality will follow with the rest of the leverage values).