This will depend on the terms and conditions set out in the offer documentation for the particular IPO. In some cases, you may be permitted to increase, decrease, or cancel your request, up until a specified deadline (for example, the close of the bookbuilding period). In other cases, often depending on when you have submitted your request, this may not be permitted and changes may no longer be possible.
If the offer price range is revised during the bookbuilding period, you will typically be notified and may be given a further opportunity to amend or withdraw your indication of interest.
You should read the offer documentation carefully to understand the rules that apply to the specific IPO in which you are participating, including any deadlines for making changes and the consequences of failing to act within the stated timeframe.
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If you are unsure whether you can still modify or withdraw your indication of interest, you should contact IBKR for guidance on the process.