François is right: your question should read montant maximum de capital mobilier choisi and Phil is right about capital mobilier (he posted his answer as I was getting mine ready!).

The question is effectively about the amount of cover the applicant (« the individual seeking insurance ») wants to buy for their furniture, clothes, works of art, equipment, anything in the house/flat that can be moved (mobilier), except for what is specifically excluded. The amount of cover is one of the criteria used by insurers to determine the amount of the insurance premium.

So,
capital (assuré) = « sum insured » in the context of property insurance
mobilier= « personal belongings » OR « contents insurance », depending on whether your things are insured when you take them out of your home (« personal belongings ») or not (« contents insurance »). Rule of thumb, you need to check what your document says.

>montant maximum de capital mobilier
>
« maximum sum insured with regard to personal belongings/contents »

What does Contents Sum Insured mean? - Its4women
https://www.its4women.ie/.../what-does-contents-sum-insured-...
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Contents sum insured refers to the amount of insurance you required and should reflect the amount of money it would cost to replace all of your contents on a ...

Contents insurance – what does a good policy look like? - Money ...
https://www.moneyadviceservice.org.uk › ... › Home insurance
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Where special events cover is in place, the insurer will automatically increase your contents sum insured. Cover for at least Christmas or other religious events, ...

Confused about contents insurance? Read our guide - AA Blog
https://www.theaa.ie/.../confused-about-contents-insurance-r...
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29 févr. 2016 - ... temporarily removed from the home while anywhere in Ireland or the UK for an amount not exceeding 15% of the contents sum insured.

Sum Insured - Building contents replacement cost information
suminsured.com.au/
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CIRCA combines contents replacement cost information with household data, to provide an automatic contents sum insured replacement cost for any property.


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Note added at 7 hrs (2019-04-04 05:43:13 GMT)
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Oops - left out the "personal belongings sum insured" examples out:

Personal and Home Insurance - CDC Insurance
https://www.cdcinsurance.co.uk/personal-and-home-insurance/
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Occupation. Telephone Number. Number of Bedrooms. Building Sum Insured. Contents Sum Insured. Personal Belongings Sum Insured. Age of Property.

[PDF]My Home Contents Policy Wording - AIG.com
https://liv-bin.dmp.aig.com/.../myhome-contents-policy-wordi...
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The most we will pay for any one event is the unspecified Personal belongings sum insured shown on your schedule. The most we will pay for any one item, pair ...

[PDF]Home insurance Product Guide - BG insurance
bginsurance.co.uk/wp-content/.../Aviva-Home-Product-Guide.pdf
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and Personal Belongings sum insured exceeds £5,000). The following are not covered under Clothing and Personal. Belongings: money, documents, skis, ...

[PDF]section two – contents (continued) - cloudfront.net
https://d2mul7yli79m9i.cloudfront.net/.../GALLAGHER_HEATH_.....
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valuables and personal belongings is equal to 75% of what your premium would have been if your valuables and personal belongings sum insured was enough ...

Home Contents Insurance Leaseholders Application by Your Homes ...
https://issuu.com/.../docs/homecontentsinsuranceleaseholders...
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14 mars 2016 - WHAT IT WILL COST Optional Extras The following prices are available for all postcode areas. Personal Belongings Sum Insured. Monthly.

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Note added at 3 days 9 hrs (2019-04-07 07:48:18 GMT)
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"option chosen" or "opted for" would best describe choisi here.

capital mobilier choisi
>
"personal belongings/contents sum insured option chosen"
OR
"personal belongings/contents sum insured opted for"