Razer Synapse loads and reads the default language on the keyboard and set the system keyboard to that layout. Change the default language to resolve this issue.
Step-by-step process
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Click “Start”.
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Navigate to Settings > Time & Language > Language.
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Click “Add a language”.

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Choose the language you wanted to add and select a specific variation if applicable.

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Select the new language and click “Options”.

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Download any of the language packs if necessary.

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Restart the laptop after installation.
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Click the downloaded language and click “Set as default”.

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Launch Razer Synapse.